MK-GPS V3.5

The new MK-GPS V3.5 is a GPS receiver with integrated compass. New are also a Master and a Salve connection. So you can use the MK-GPS V3.5 as a single modul, or as a twin system on your redundant copter.

Beside the usual American GPS satellites, the Russian Glonas satellite systems or the Chinese BeiDou satellite systems can be received. For suppressing external interference sources (e.g. video systems), the GPS receiver has been equipped with an RF preamplifier, and a SAW RF Filter.

GPS / Glonas / BeiDou

Beside the usual American GPS satellites, the Russian Glonas satellite systems or the Chinese BeiDou satellite systems can be received. So you have much more satellites for a much better navigation (especially in areas with inadequate GPS coverage).

Under the virtual display klick the red arrow (left or right) until the window "Magnetic Field" displayed.

The value for "Field" must be around 100% and the value for Inclination around the value you see in brackets.(If the value for "Field" (or for "Inclination") is ~10%-15% higher/lower then 100%, recalibrate the compass)

To see the right values of the calibration you have to calibrate the Gyros again (throttle up + yaw left). Now you can check the magnetic value in the lower display of the Graupner HoTT transmitter.

How to open it:

With the right "four-way button" select the middle button SET to open the Menu

Go down to Telemetry and press SET

In the telemetry window choose setting & data view and press SET

In the next menu press the right button until you see the "Text-telemetry"

To change the view of "0m/s" to "MAG" press SET again.

The value for "MAG" must be around 100% and the value for Inclination (incl) around the value you see in brackets.If the value for "Field" (or for "Inclination") is ~10%-15% higher/lower then 100%, recalibrate the compass!

NMEA

From software version 2.02a (FlightCtrl/NaviCtrl) we can also send the NMEA signal from the UBlox GPS. If you use a camera with integrated data logging you can use this data to save the position data n the pictures.

You can get the NMEA signal on the contacts PIN9 (TxD) + PIN7 (GND) of your serial output (FlightCtrl V3) or Debug port (NaviCtrl). The data records RMC & GGA are sent with 57600 Baud '(default) / TTL (5V).

Setting

On this microSD card you find the file "SETTINGS.INI". You can open and change this file via an editor. The output interval of the NMEA signal is set with the parameter NMEA_INTERVAL.

# NMEA Output interval in ms (0 = disabled) NMEA_INTERVAL = 0

By default, the output is disabled (NMEA_INTERVAL = 0)If you need a signal e.g. every 500ms set here a "500" (NMEA_INTERVAL = 500)

The output is 57600 baud. From SW-Version 2.20 you can change the output speed under "# Baudrate for the PC-UART".

IMPORTANT:If you change the baud in your SETTINGS.INI all data will be send in this speed !!! So if you use e.g. a wireless connection between Copter <-> PC you also have to change here the speed!

INFO: If there is no Parameter "# NMEA Output interval in ms" in your SETTINGS.INI, delete the "SETTINGS.ini" on your microSD card. After you power up the copter the Software on your copter will create a new "SETTINGS.INI" with the needed parameters.

Check output

If you set a NMEA_INTERVAL in your SETTINGS.INI, you can check the output data in the terminal window of your KopterTool.

For this "click" the button [-> NaviCtrl] in your KopterTool and then the button [Firmware update & Terminal] to open the terminal window. Here you should now see some data like this: